不允许删除最后一个管理员工作项，这是因为相应的实例对象必须保持能够管理。
You are not allowed to delete the last administrator work item, since the corresponding instance object must remain manageable.
在一个实例对象上为另一个人创建一个工作项。
Creating a work item on an instance object for an additional person.
在接下来的部分中，我们将创建自定义Web客户端，该客户端可以为BPEL流程创建新实例并提供自定义的界面来管理工作项。
In the next section, we will create a custom Web client that could create a new instance for this BPEL process and as well to provide an custom interface to manage the work items.
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